Lasted a month with some left, I had to pay for the convertion exams, can't remenber how much, that was a long time ago.
I stayed in Dar Es Salaam, did not need to travel. Hotel (very basic) are cheap. I had to stay dry as well for a month (no beer no wine, rough time!)
I was lucky I guess, so were all the guy who flew there.
Just be professional and respect local people and pilots who are as good as you.
The civil aviation are doing pretty good and some of the staff are very competent despite the little funds they get.
Good luck! Bahati njema!